Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th
8th Edition
ISBN: 9781305494701
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 15, Problem 14R
How can slag be cleaned off of FCAW-G and FCAW-S welds?
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2. Consider a polymeric membrane within a 6 cm diameter stirred ultrafiltration cell. The membrane is
30 μm thick. The membrane has pores equivalent in size to a spherical molecule with a molecular weight
of 100,000, a porosity of 80%, and a tortuosity of 2.5. On the feed side of the membrane, we have a
solution containing a protein at a concentration of 8 g L-1 with these properties: a = 3 nm and DAB = 6.0 ×
10-7 cm² s¹. The solution viscosity is 1 cP. The hydrodynamic pressure on the protein side of the
membrane is 20 pounds per square inch (psi) higher than on the filtrate side of the membrane. Assume
that the hydrodynamic pressure difference is much larger than the osmotic pressure difference
(advection >> diffusion). Determine the convective flow rate of the solution across the membrane.
1. Calculate the filtration flow rate (cm³ s¹) of a pure fluid across a 100 cm² membrane. Assume the
viscosity (µ) of the fluid is 1.8 cP. The porosity of the membrane is 40% and the thickness of the
membrane is 500 μm. The pores run straight through the membrane and these pores have a radius of
0.225 μm. The pressure drop applied across the membrane is 75 psi. (Note: 1 cP = 0.001 N s m²² = 0.001
Pa s.)
3. Tong and Anderson (1996) obtained for BSA the following data in a polyacrylamide gel for the
partition coefficient (K) as a function of the gel volume fraction (4). The BSA they used had a molecular
weight of 67,000, a molecular radius of 3.6 nm, and a diffusivity of 6 × 10-7 cm2 s-1. Compare the
Ogston equation
K=exp
+
to their data and obtain an estimate for the radius of the cylindrical fibers (af) that comprise the gel.
Hint: You will need to plot Ink as a function of gel volume fraction as part of your analysis. Please include
your MATLAB, or other, code with your solution.
Gel Volume Fraction (4)
KBSA
0.00
1.0
0.025
0.35
0.05
0.09
0.06
0.05
0.075
0.017
0.085
0.02
0.105
0.03
Chapter 15 Solutions
Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th
Ch. 15 - How are the sheet steel workmanship samples tested...Ch. 15 - What size are the fillet welds in Practice 15-2?Ch. 15 - How should the welds be cleaned on workmanship...Ch. 15 - What is the acceptable undercut on workmanship...Ch. 15 - In Practice 15-3, what size should the root face...Ch. 15 - How wide of an area should be cleaned on the plate...Ch. 15 - What is the root opening for the butt joints in...Ch. 15 - How is the 1 in. diameter hole cut in the...Ch. 15 - According to Figure 15-15, how are the test...Ch. 15 - According to Practice 15-6, after each weld pass...
Ch. 15 - What is the bevel angle for the test plates in...Ch. 15 - What type of groove is required for 2G butt welds?Ch. 15 - What weave pattern is used for the cover pass on...Ch. 15 - How can slag be cleaned off of FCAW-G and FCAW-S...Ch. 15 - Prob. 15RCh. 15 - What shielding gas mixture and flow rate are...Ch. 15 - What is the maximum interpass temperature for...Ch. 15 - What is the maximum allowable undercut for a...Ch. 15 - What shielding gas mixture and flow rate are...Ch. 15 - What are the maximum acceptance criteria for bend...Ch. 15 - According to Table 15-4, what is the range of...
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